Solution. We have the Percent, and we have the
Base -- it follows "of." We are missing the Amount. Apply Rule 1: Multiply

Base × Percent.

Press

4

8

.

7

2

×

3

7

.

5

%

Press the percent key % last. And when you press the percent key, do not press = . (At any rate, that is true for simple calculators.)

The answer is displayed:

18.27

If your calculator does not have a percent key, then express the percent as a decimal (Lesson 4), and press = . Press

4

8

.

7

2

×

.

3

7

5

=

Example 2. $250 is 62.5% of how much?

Solution. The Base -- the number that follows
"of" is unknown. Apply Rule 2: Divide:

Amount ÷ Percent.

Press

2

5

0

÷

6

2

.

5

%

Do not press = . The answer is
displayed:

400

Now, for calculators that instead of a division key ÷ have the division slash / , the percent key % will not be effective in finding the Base or the Percent. To find the Base, do not press the percent key. Press equals = . Then multiply by 100.